Control unit for a surveillance system



FIG. 1 is an isometric view from the left and front of a control unitfor a surveillance system showing my new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a right side elevational view thereof; the left sideelevational view being the same;

FIG. 4 is a rear elevational view thereof; and,

FIG. 5 is a bottom plan view thereof.

The ornamental design for a control unit for a surveillance system, asshown and described.